弹力方向相反，所以弹力有个负号，来表示方向。

So the spring force is opposing that, so the spring force has a minus sign here to indicate the direction.

youdao

基于本体的知识表达是当前知识表示方向的一个研究热点。

The knowledge presentation based on Ontology is one of hot topics in knowledge presentation domain.

youdao

基于本体的知识表达是当前知识表示方向的一个研究热点。

Knowledge representation based on ontology is an active research in the study of knowledge representation.

youdao

So the idea here is shooting to the left if you're right footed is the natural direction, so left here means the natural direction.

就是说如果你习惯用右脚射门,那么你从左路攻门就是自然方向,在这里左路表示自然方向

耶鲁公开课 - 博弈论课程节选

But it's a notion that's complicated in this case by the equally imperative notion "get out of the way," which doesn't at all necessarily entail stopping but rather accelerating in a different direction.

但是值得注意，这很复杂,正如红灯有时表示别挡路,它也不是从来都只表示停止,有时也表示向相反方向前进。

耶鲁公开课 - 文学理论导论课程节选

Infinity is the force when we're thinking about it and our brains, negative infinity is when we actually plug it into the equation here, and the reason is the convention that the negative sign is just telling us the direction that the force is coming together instead of pushing apart.

说力有多大时，我们想到的,是无穷大，而方程解出来的,是负无穷，这是因为习惯上,我们用负号表示力的方向,是相互吸引而不是相互排斥的,所以我们可以用库仑定律。

麻省理工公开课 - 化学原理课程节选